Others
- Thomas Morgan (of Llantarnam) (1546–1606), confidant and spy of Mary Stuart, Queen of Scots
- Sir Thomas Morgan, 1st Baronet (1604–1679), general of the English Civil War
- Thomas Hunt Morgan (1866–1945), American geneticist and embryologist
- Thomas Morgan (deist) (died 1743), Welsh philosopher
- Thomas Morgan (navy chaplain) (1769–1851), navy chaplain during the French Revolutionary Wars and chaplain of Portsmouth Dockyard
- Thomas R. Morgan (born 1930), general in the US Marine Corps
- Thomas Morgan (footballer) (born 1977), former Irish footballer
- Thomas Charles Morgan (1783–1843), English physician and writer
- Thomas J. Morgan (1847–1912), English-born American labor leader and socialist political activist
- Thomas Morgan (bishop) (born 1941), retired bishop of the Anglican Church of Canada
- Thomas Henry Morgan, architect in the U.S. state of Georgia
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